a novel installation method deepwater conductors miller...marine construction & engineering...

A Novel Installation Methodfor Deepwater Conductors

1Tuesday, April 8th, 201417:00‐17:20

Marine Construction & Engineering Deepwater DevelopmentsMadrid, Spain

TLP, Offshore

• Field layout and target spec• Jetted conductors – review• Driven conductors – review • Installation methodology• Obstacles and solutions• As installed condition• Conclusions

Overview

Tuesday, April 8th, 201417:00‐17:20


2

24 m36 m

9% Grade

Field layout & target spec



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15 @ 60 m x 914mm x 38mm WT – 60T5 Templates

±10cm1 deg

Horizontal

Inclination Tolerance

Stick‐up Tolerance

1182m Water Depth



4

Jetted conductors ‐ review

+ Very mature method+ Very long conductors address capacity uncertainty

– Reduced soil cohesion– Reconsolidation time varies– Susceptible to shallow flow (Ursa)– Long rig‐time hold – costly– Settles if hold period is too short– Imprecise AS‐BUILT well coordinates

ADVANTAGES / CHALLENGESADVANTAGES / CHALLENGES



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Driven conductors ‐ review

+ Mature driving technology (pre‐1900)+ Batch‐set cost benefits+ Affordable installation vessels+ Precise control of final position+ Short installation time+ Use shorter conductor for same soils– Experienced installers are few– Specialized equipment (Hammer, STS, shuttle system)

ADVANTAGES / CHALLENGESADVANTAGES / CHALLENGES



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Installation methodology



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Installation methodology



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Project resources



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Equipment onboardTP‐1

TP‐2

TP‐3

TP‐4TP‐5

TP‐6

TP‐7Working Zone

Acoustic Positioning SystemAcoustic Positioning System

Deepwater Subsea HammerDeepwater Subsea Hammer

• MENCK 270kJ• Up to 3000m WD

• LBL Array• 7 Compatts

Shuttle SystemShuttle System

STS HeadSTS Head



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Installation procedureTripod

with

Com

patt x7

Logistics

Installatio

n

1. Deploy LBL array1. Deploy LBL array 2. Deploy 5 templates2. Deploy 5 templates



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Installation procedure3. Deploy Conductor3. Deploy Conductor

4. Self‐weight penetration4. Self‐weight penetration

Verticality

Che

ck

Guide

Con

e

5. ROV Suction Penetration5. ROV Suction Penetration

Suction at STS Head

Pressure gau

ge



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Installation procedureDetache

d STS Head

Ope

n guide cone

s

6. STS & template recovery6. STS & template recovery

Driv

ing complete

Land

ham

mer

7. Batch hammering7. Batch hammering

Spider Too

l and

Com

patt

8. Final as‐laid survey8. Final as‐laid survey

Self‐weight• Avg: 14.4m (~26%)• Min: 13.0m• Max: 15.4m

Suction• Avg: 16.3m (~29%)• Add: +2.0m (~3.6%)• Min: +1.5m• Max: +2.8m

As‐installed condition



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• Any subsea installation• Immediate capacities known•Meet strict location spec• Precise stick‐up control

Conclusions• Time savings

• Work begins immediately• Off Rig critical path

• Less soil disturbance



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Novel Installation Method for Deepwater ConductorsPresenting Author:

Jonathon Miller([email protected])

Co‐Authors:Michael O’Driscoll

João Ruiz Ariel de Silvio

www.intermoor.comAngola Brazil Egypt Malaysia Mexico Nigeria Norway Singapore United Kingdom United States

a novel installation method deepwater conductors miller...marine construction & engineering...

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